79 lines
2.0 KiB
HTML
79 lines
2.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - get_fattime</title>
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</head>
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<body>
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<div class="para func">
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<h2>get_fattime</h2>
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<p>The get_fattime function is called to get the current time.</p>
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<pre>
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DWORD get_fattime (void);
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</pre>
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</div>
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<div class="para ret">
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<h4>Return Value</h4>
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<p>Currnet local time shall be returned as bit-fields packed into a <tt>DWORD</tt> value. The bit fields are as follows:</p>
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<dl class="ret">
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<dt>bit31:25</dt>
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<dd>Year origin from the 1980 (0..127, e.g. 37 for 2017)</dd>
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<dt>bit24:21</dt>
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<dd>Month (1..12)</dd>
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<dt>bit20:16</dt>
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<dd>Day of the month (1..31)</dd>
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<dt>bit15:11</dt>
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<dd>Hour (0..23)</dd>
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<dt>bit10:5</dt>
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<dd>Minute (0..59)</dd>
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<dt>bit4:0</dt>
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<dd>Second / 2 (0..29, e.g. 25 for 50)</dd>
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</dl>
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</div>
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<div class="para desc">
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<h4>Description</h4>
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<p>The <tt>get_fattime</tt> function shall return any valid time even if the system does not support a real time clock. If a zero is returned, the file will not have a valid timestamp.</p>
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</div>
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<div class="para comp">
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<h4>QuickInfo</h4>
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<p>This function is not needed when <tt><a href="config.html#fs_readonly">FF_FS_READONLY</a> == 1</tt> or <tt><a href="config.html#fs_nortc">FF_FS_NORTC</a> == 1</tt>.</p>
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</div>
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<div class="para use">
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<h4>Example</h4>
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<pre>
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DWORD get_fattime (void)
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{
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time_t t;
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struct tm *stm;
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t = time(0);
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stm = localtime(&t);
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return (DWORD)(stm->tm_year - 80) << 25 |
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(DWORD)(stm->tm_mon + 1) << 21 |
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(DWORD)stm->tm_mday << 16 |
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(DWORD)stm->tm_hour << 11 |
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(DWORD)stm->tm_min << 5 |
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(DWORD)stm->tm_sec >> 1;
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}
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</pre>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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